Self-induction water pumping device for deep foundation pit dewatering

Abstract

The invention discloses a deep foundation pit dewatering self-induction water pumping device, and relates to the field of foundation pit dewatering, the deep foundation pit dewatering self-induction water pumping device comprises a shell, the shell comprises a well wall pipe, water seepage holes are formed in the side wall of the well wall pipe, a conical head is fixedly mounted at the bottom of the well wall pipe, a storage cavity is formed in the conical head, and a frustum is fixedly mounted at the top of the well wall pipe; the filtering inner container comprises a mounting cylinder and a filtering part; the mounting cylinder is arranged in the well wall pipe and is coaxial with the well wall pipe; the filtering part is connected to the outer wall of the mounting cylinder in a sleeving manner; according to the invention, the mesh size of the flexible filter screen is dynamically adjusted along with the backflushing and water pumping process, and the filter screen is cleaned without dead angles in cooperation with spiral backflushing water flow, so that the filtering and backflushing efficiency is greatly improved; meanwhile, a top water inlet, a well wall water seepage hole and a conical head sewage inlet hole of the device can be synchronously plugged during backflushing, backflushing sewage is thoroughly prevented from flowing back to a soil layer or overflowing to a foundation pit, and dryness of the foundation pit and stability of the soil layer are guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit dewatering technology, specifically, it relates to a self-induction pumping device for deep foundation pit dewatering. Background Technology

[0002] In the construction of building projects, municipal projects (such as subway tunnels and underground utility tunnels) and large industrial facilities, deep foundation pit construction requires the use of dewatering technology to lower the groundwater level below the bottom of the foundation pit in order to avoid safety accidents such as sidewall collapse and piping, and to ensure construction efficiency.

[0003] Currently, the mainstream wellpoint dewatering system is the core technology for deep foundation pit dewatering. However, the deficiencies of this type of system in terms of filtration, cleaning, and backwash wastewater control have become the core bottleneck restricting dewatering efficiency and foundation pit safety. The specific problems are as follows: Deep foundation pit seepage water contains a large amount of mud, sand, gravel, and construction impurities. Existing well equipment mostly uses fixed-pore-size filters for mud-water separation, lacking dynamic adjustment and efficient cleaning mechanisms. After long-term use, impurities tend to adhere to the filter screen and form a blockage layer, which leads to a sharp drop in water permeability and a significant reduction in pumping efficiency. If it rains, the blockage of the filter screen, which is not cleaned in time, will not drain water quickly and may cause short-term water accumulation in the foundation pit. During the backflushing process, wastewater carrying a large amount of impurities can easily flow back into the surrounding soil layer through the seepage holes on the sidewall of the manhole, causing the already drained soil layer to become resaturated. This not only weakens the dewatering effect but also softens the soil structure and reduces the stability of the foundation pit sidewall. At the same time, some backflushing wastewater overflows directly into the foundation pit, requiring additional pumping equipment for treatment, which increases construction costs. If the wastewater seeps into the foundation pit base, it will also cause a decline in the mechanical properties of the base soil, leading to the risk of base heave and seriously threatening construction safety.

[0004] In view of the above problems, a self-induction pumping device for deep foundation pit dewatering is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a deep foundation pit dewatering self-induction pumping device that can overcome or at least partially solve the above problems.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A self-sensing pumping device for deep foundation pit dewatering includes: an outer shell, comprising a well wall pipe with seepage holes on its sidewalls, a cone head fixedly installed at the bottom of the well wall pipe, a storage cavity disposed inside the cone head, and a frustum fixedly installed at the top of the well wall pipe; a filter inner liner, comprising an installation cylinder disposed inside the well wall pipe and coaxial with the well wall pipe, and a filter part sleeved on the outer wall of the installation cylinder; a sealing block fixedly installed at the top of the installation cylinder, and a pumping pipe extending into the installation cylinder and a drain pipe extending into the storage cavity fixedly installed on the sealing block; a drive assembly disposed on the installation cylinder; and a backflushing and sealing assembly disposed inside the outer shell. When the water pressure inside the drive assembly increases, the drive assembly drives the sealing assembly to seal the outer shell; when the water pressure inside the drive assembly decreases, the elastic element in the drive assembly drives the sealing assembly to reset.

[0007] As a preferred embodiment of the present invention: the outer shell further includes a cone fixedly installed on the top of the well wall pipe; a first soil-breaking block is fixedly installed on the outer wall of the cone, a second soil-breaking block is fixedly installed on the outer wall of the cone head, the maximum diameter of the cone head and the cone are both greater than the diameter of the well wall pipe, and a handle is fixedly installed on the top of the cone.

[0008] As a preferred embodiment of the present invention: a sludge inlet hole is provided on the conical wall of the cone head, the bottom of the storage cavity is provided as a downwardly recessed groove, a water inlet hole is provided on the wall of the mounting cylinder, an arc-shaped first connecting block is fixedly installed on the inner side of the storage cavity, the mounting cylinder is fixedly connected to the first connecting block, an upwardly recessed flow-gathering groove is provided at the bottom of the mounting cylinder, and check valves are provided at the water inlet end of the bottom of the pumping pipe and the water inlet end of the bottom of the sewage discharge pipe.

[0009] In a preferred embodiment of the present invention: the driving assembly includes a mounting sleeve fixedly installed on the top of the mounting cylinder, a first sliding groove is provided on the side wall of the mounting sleeve, a sealing slider is slidably installed in the first sliding groove, a piston plate is fixedly installed inside the mounting sleeve by the sealing slider, a drain pipe is fixedly installed at the bottom of the piston plate, a pressure control valve is provided on the drain pipe, a sliding sealing ring is fixedly installed outside the mounting sleeve by the sealing slider, and a clean water pipe is fixedly installed on the top of the mounting sleeve, the inlet end of the clean water pipe is connected to a high-pressure water pump outside the foundation pit.

[0010] In a preferred embodiment of the present invention: the plugging assembly includes a plugging head, an mounting frame is fixedly installed on the inner wall of the well casing, a second sliding groove is provided on the mounting frame, an mounting plate is slidably installed in the second sliding groove, a guide post is fixedly installed on the mounting frame, the mounting plate is slidably connected to the guide post, the plugging head is fixedly installed on the mounting plate, a connecting rod is slidably installed on the mounting frame, one end of the connecting rod is fixedly connected to the mounting plate, a second wedge block is fixedly installed on the other end of the connecting rod, and a pushing assembly for driving the second wedge block to slide is provided at the bottom of the sliding sealing ring.

[0011] As a preferred embodiment of the present invention: the pushing assembly includes a driving sleeve fixedly installed at the bottom of the sliding sealing ring, a first wedge block fixedly installed on the side wall of the driving sleeve, an elastic element sleeved on the guide post, and the two sides of the elastic element abutting against the inner wall of the mounting plate and the well wall pipe, respectively.

[0012] As a preferred embodiment of the present invention: the sealing assembly further includes a sealing cover, a hinge seat is fixedly installed on the inner wall of the cone, the sealing cover is rotatably mounted on the hinge seat, the sealing cover is hemispherical, and when the sliding sealing ring descends, the mounting plate abuts against the outer wall of the sealing cover.

[0013] In a preferred embodiment of the present invention: the filter part includes a flexible filter screen, and a fixed ring and a sliding ring are fixedly installed at both ends of the filter screen, respectively. The fixed ring is fixedly installed at the bottom of the side wall of the mounting cylinder, and the sliding ring is slidably installed at the top of the side wall of the mounting cylinder. A second connecting block is fixedly installed at the top of the sliding ring, and the second connecting block is fixedly connected to the side wall of the first wedge block.

[0014] As a preferred embodiment of the present invention: a diversion plate is fixedly installed inside the mounting sleeve, and an arc-shaped water spray groove is provided inside the diversion plate. When in use, high-pressure purified water enters the diversion plate and is sprayed into the inner wall of the mounting cylinder and the filter screen in a spiral flow by the guidance of the arc-shaped water spray groove.

[0015] As a preferred embodiment of the present invention: a first water level probe is fixedly installed at the bottom of the diversion plate, and a second water level probe is fixedly installed at the bottom of the inner side wall of the mounting cylinder.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention dynamically adjusts the mesh size of the flexible filter screen according to the backwashing and pumping process, and achieves thorough cleaning of the filter screen without dead corners by means of spiral backwashing water flow, which greatly improves the filtration and backwashing efficiency; at the same time, the top water inlet of the device, the seepage hole of the well wall and the sewage inlet of the cone head can be sealed simultaneously during backwashing, which completely prevents the backwash sewage from flowing back to the soil layer or overflowing into the foundation pit, ensuring the dryness of the foundation pit and the stability of the soil layer; it can also automatically control the start and stop of the pumping pump through dual water level probes, without the need for manual operation, and the device can be quickly buried with the help of an excavator and can be used to complete sewage discharge and maintenance without disassembly, which significantly reduces labor and construction costs, and improves the safety, stability and economy of deep foundation pit dewatering as a whole.

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of a self-induction pumping device for dewatering deep foundation pits proposed in this invention. Figure 2 This is a main sectional view of a self-induction pumping device for dewatering deep foundation pits proposed in this invention; Figure 3 This is a schematic diagram of the drive assembly of a self-induction pumping device for deep foundation pit dewatering proposed in this invention. Figure 4 This is a schematic diagram of the sealing component of a self-induction pumping device for deep foundation pit dewatering proposed in this invention. Figure 1 ; Figure 5 for Figure 4 Schematic diagram of the structure at point A; Figure 6 This is a schematic diagram of the installation cylinder of a self-induction pumping device for deep foundation pit dewatering proposed in this invention; Figure 7 This is a schematic diagram of the sealing component of a self-induction pumping device for deep foundation pit dewatering proposed in this invention. Figure 2 ; Figure 8 This is a schematic diagram of the push assembly of a self-induction pumping device for deep foundation pit dewatering proposed in this invention; Figure 9 This is a schematic diagram of the filter section of a self-induction pumping device for deep foundation pit dewatering proposed in this invention. Figure 10 This is a cross-sectional view of the outer casing of a self-induction pumping device for deep foundation pit dewatering proposed in this invention. Figure 11 This is a schematic diagram of the diversion plate of a self-induction pumping device for deep foundation pit dewatering proposed in this invention.

[0019] In the diagram: 1. Well wall pipe; 11. Cone head; 12. Conical frustum; 13. First soil-breaking block; 14. Second soil-breaking block; 15. Seepage hole; 16. Sewage inlet; 17. Handle; 18. First connecting block; 19. Storage cavity; 2. Mounting cylinder; 21. Water inlet; 22. Mounting sleeve; 23. First slide groove; 3. Pushing assembly; 31. Drive sleeve; 32. Sliding sealing ring; 33. Piston plate; 34. Sealing slider; 35. First wedge block; 4. Mounting bracket; 41. Guide column; 42. Second chute; 5. Mounting plate; 51. Connecting rod; 52. Sealing head; 53. Second wedge block; 54. Elastic element; 6. Hinge seat; 61. Sealing cover; 7. Filter section; 71. Sliding ring; 72. Fixing ring; 73. Filter screen; 74. Second connecting block; 8. Sealing block; 81. Pumping pipe; 9. Clean water pipe; 91. Drainage pipe; 92. Sewage pipe; 93. Diverter plate; 931. Arc-shaped spray trough; 10. First water level probe; 101. Second water level probe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Example: Refer to Figures 1-11 A deep foundation pit dewatering self-sensing pumping device includes an outer shell, the outer shell including a well wall pipe 1 with seepage holes 15 on the side wall, a cone head 11 fixedly installed at the bottom of the well wall pipe 1, a truncated cone 12 fixedly installed at the top of the well wall pipe 1, a first soil breaking block 13 fixedly installed on the outer wall of the truncated cone 12, and a second soil breaking block 14 fixedly installed on the outer wall of the cone head 11. The maximum diameter of both the cone head 11 and the truncated cone 12 is larger than the diameter of the well wall pipe 1, and a handle 17 is fixedly installed at the top of the truncated cone 12.

[0022] The upper end face of the cone 12 has a larger diameter than the lower end face, the cross-section of the cone head 11 is pentagonal, a sludge inlet 16 is provided on the cone wall of the cone head 11, a storage cavity 19 is provided inside the cone head 11, and the bottom of the storage cavity 19 is a downward recessed groove.

[0023] When in use, place the outer casing in the low-lying area or the middle of the pit, and then use the excavator bucket to press the handle 17 to press the outer casing into the pit until the cone 12 contacts the pit surface. During normal pit excavation, the soil around the device can be excavated first, leaving a safe range (a soil layer 20 to 30 centimeters away from the outer wall of the device). After all soil layers outside the safe range have been excavated, press the handle 17 with the excavator bucket. During the pressing process, the first soil-breaking block 13, the second soil-breaking block 14, the cone 12, and the cone head 11 squeeze the soil in the safe range. The soil in the safe range is squeezed and broken, completing the final treatment of the soil around the device. At the same time, the device continues to descend until the height of the cone 12 is again within the safe water level range inside the pit, so that water can be drained in case of rain or water accumulation inside the pit.

[0024] Reference Figures 2-4 , Figure 6 , Figure 9 and Figure 10 It also includes a filter inner liner, which includes an installation cylinder 2 installed inside the well wall pipe 1 and coaxial with the well wall pipe 1, and a filter part 7 sleeved on the outer wall of the installation cylinder 2. The cylinder wall of the installation cylinder 2 is provided with a water inlet hole 21. An arc-shaped first connecting block 18 is fixedly installed on the inner side of the storage cavity 19. The installation cylinder 2 is fixedly connected to the first connecting block 18. The bottom of the installation cylinder 2 is provided with an upwardly recessed flow collection groove. The top of the installation cylinder 2 is fixedly installed with a sealing block 8. A water pumping pipe 81 extending into the installation cylinder 2 and a sewage discharge pipe 92 extending into the storage cavity 19 are fixedly installed on the sealing block 8. The water pumping pipe 81 is connected to a water pump outside the foundation pit through a pipe. The sewage discharge pipe 92 is connected to a water collection pool (or water collection tank or other water collection equipment) outside the foundation pit through a pipe.

[0025] The inlet end of the pumping pipe 81 and the inlet end of the drain pipe 92 are both equipped with check valves to prevent the filtered water and sewage from flowing back.

[0026] During use, water from the pit or soil seeps into the shell through the seepage hole 15 and is filtered by the filter section 7 before entering the inner side of the installation cylinder 2. The external water pump then pumps out the filtered water through the water pumping pipe 81.

[0027] On the one hand, the device uses the filter section 7 to efficiently filter the open water entering the pit through the top of the outer shell and the soil seepage water entering through the seepage hole 15, intercepting mud and impurities in the water and preventing them from entering the installation cylinder 2. This ensures the cleanliness of the water pumped out by the pumping pipe 81 and prevents impurities from clogging the pumping pipe 81 and the external pump, effectively extending the service life of the pump and the pumping pipe 81. On the other hand, the pumping pipe 81 extending from the sealing block 8 into the installation cylinder 2 and the drain pipe 92 extending into the storage chamber 19 make the pumping and draining channels independent of each other. The filtered clean water can be quickly discharged from the pit by the pumping pipe 81 through the pumping pipe 81. Some of the impurities produced by filtration and the mud and sand entering the storage chamber 19 through the sewage inlet 16 can be discharged to the external collection tank through the drain pipe 92. The sewage can be discharged without disassembling the device, simplifying the maintenance process.

[0028] Reference Figure 2 , Figure 6 and Figure 8 An installation sleeve 22 is fixedly installed on the top of the installation sleeve 2. A first sliding groove 23 is provided on the side wall of the installation sleeve 22. A sealing slider 34 is slidably installed in the first sliding groove 23. A piston plate 33 is fixedly installed inside the installation sleeve 22. A sliding sealing ring 32 is fixedly installed outside the installation sleeve 22. A clean water pipe 9 is fixedly installed on the top of the installation sleeve 22. The inlet end of the clean water pipe 9 is connected to a high-pressure water pump outside the foundation pit. The high-pressure water pump is connected to a clean water source such as tap water. A drain pipe 91 is fixedly installed at the bottom of the piston plate 33. A pressure control valve is provided on the drain pipe 91.

[0029] During use, the high-pressure water pump delivers water through the clean water pipe 9 to the water chamber composed of the piston plate 33, the mounting sleeve 22, the sliding sealing ring 32, and the sealing block 8. Under the action of water pressure, the piston plate 33 drives the sliding sealing ring 32 to descend, blocking the water inlet between the top of the cone 12 and the top of the mounting sleeve 22. When the water pressure inside the water chamber reaches the preset value of the pressure control valve, it enters the interior of the mounting cylinder 2 through the drain pipe 91 and then backwashes the filter section 7. The water after backwashing the filter section 7 impacts the mud and sand in the storage chamber 19 along the inclined wall and arc wall of the storage chamber 19 in the cone 11, and then is guided into the sewage pipe 92 along the flow collection groove, discharging the mud, sand, and other impurities along the sewage pipe 92.

[0030] In summary, this device, on the one hand, delivers water to a specific water chamber via a high-pressure water pump and a clean water pipe 9. The water pressure drives the piston plate 33, causing the sliding sealing ring 32 to descend. This precisely blocks the water inlet between the top of the cone 12 and the top of the mounting sleeve 22, preventing external impurities or unfiltered water from entering the mounting cylinder 2 during backflushing. It also forms a sealing barrier, preventing water accumulated during backflushing from overflowing from the inlet and entering the foundation pit, thus avoiding additional water accumulation in the foundation pit due to backflushing operations. On the other hand, when the water pressure in the water chamber reaches the preset value of the pressure control valve, water enters the mounting cylinder 2 through the drain pipe 91 for backflushing. The filter section 7 can effectively remove the mud and impurities attached to it, restore its filtration efficiency, and prevent the water pumping and drainage effect from decreasing due to clogging. On the other hand, the water after backwashing the filter section 7 can impact the mud and sand in the storage chamber 19 along the inclined and arc-shaped walls of the storage chamber 19 in the cone head 11, and then be guided into the drain pipe 92 through the flow collection tank for discharge. This not only achieves reasonable flow of backwash wastewater, but also simultaneously cleans the impurities deposited in the storage chamber 19. The cleaning of the filter section 7 and the discharge of impurities can be completed without disassembling the device, further simplifying maintenance operations and ensuring long-term stable operation of the device.

[0031] Reference Figures 2-5 , Figure 7 and Figure 8 To prevent water from being discharged through the seepage hole 15 during backflushing, a plugging head 52 is also included. An installation frame 4 is fixedly installed on the inner wall of the well wall pipe 1. A second sliding groove 42 is provided on the installation frame 4. An installation plate 5 is slidably installed in the second sliding groove 42. A guide column 41 is fixedly installed on the installation frame 4. The installation plate 5 is slidably connected to the guide column 41. The plugging head 52 is fixedly installed on the installation plate 5. A connecting rod 51 is slidably installed on the installation frame 4. One end of the connecting rod 51 is fixedly connected to the installation plate 5. A second wedge block 53 is fixedly installed on the other end of the connecting rod 51. A pushing assembly 3 for driving the second wedge block 53 to slide is provided at the bottom of the sliding sealing ring 32.

[0032] Reference Figure 3 and Figure 8 The push assembly 3 includes a drive sleeve 31 fixedly installed at the bottom of the sliding sealing ring 32. A first wedge block 35 is fixedly installed on the side wall of the drive sleeve 31. An elastic element 54 (corrosion-resistant elastic rubber or corrosion-resistant spring) is sleeved on the guide post 41. The two sides of the elastic element 54 abut against the inner wall of the mounting plate 5 and the well wall pipe 1, respectively.

[0033] When the sliding sealing ring 32 descends, it drives the first wedge block 35 to descend via the drive sleeve 31. The first wedge block 35 and the second wedge block 53 are engaged by an inclined surface. During the descent of the first wedge block 35, the second wedge block 53 is squeezed, driving the second wedge block 53 to move towards the outside of the well wall pipe 1. This drives the plugging head 52 to be inserted into the seepage hole 15 via the connecting rod 51 and the mounting plate 5, thereby sealing the seepage hole 15. After the backwashing and the cleaning of mud and sand in the storage chamber 19 are completed, the pressure control valve reduces the pressure of the clean water sprayed out of the water chamber. At this time, the rebound potential energy of the elastic element 54 is greater than the pressure inside the water chamber. Therefore, the elastic element 54 drives the second wedge block 53 and the plugging head 52 to reset.

[0034] In summary, when the sliding sealing ring 32 descends, the drive sleeve 31 drives the first wedge block 35 to descend. The inclined surfaces of the first wedge block 35 and the second wedge block 53 engage and compress, driving the second wedge block 53 to move the connecting rod 51 and the mounting plate 5 towards the outside of the well wall pipe 1. This allows the sealing head 52 to be precisely inserted into the seepage hole 15, effectively preventing water from draining out of the seepage hole 15 during the backflushing process. This avoids backflushing water flowing back into the pit, increasing the water accumulation burden, while ensuring that the backflushing pressure is concentrated on the filter section 7, improving the backflushing cleaning effect. Furthermore, the guide column 41 on the mounting frame 4... The mounting plate 5 provides a stable sliding guide, which, together with the support of the elastic element 54, ensures the accuracy of the movement of the plugging head 52. This avoids the inability to accurately seal the seepage hole 15 due to deviation. Furthermore, after the backflushing and silt removal in the storage chamber 19 are completed, the pressure control valve reduces the water chamber pressure. The elastic element 54 can drive the second wedge block 53 and the plugging head 52 to automatically reset by the rebound potential energy. No manual operation is required, which simplifies the device recovery process. After reset, the seepage hole 15 can be filled with water normally without affecting the subsequent dewatering and pumping functions of the device, further ensuring the continuity and convenience of the overall operation of the device.

[0035] Reference Figures 2-5 , Figure 7 and Figure 8 To prevent sewage from entering the soil and foundation pit through the sewage inlet 16 during backflushing, a sealing cover 61 is also included. A hinge seat 6 is fixedly installed on the inner wall of the cone head 11. The sealing cover 61 is rotatably mounted on the hinge seat 6. The sealing cover 61 is hemispherical. When the sliding sealing ring 32 descends, the mounting plate 5 abuts against the outer wall of the sealing cover 61, thereby driving the sealing cover 61 to cover the sewage inlet 16. After the elastic element 54 drives the mounting plate 5 to reset, the water pressure inside the soil drives the sealing cover 61 to rotate, thereby allowing the mud and sand in the foundation pit and soil to enter the storage chamber 19 through the sewage inlet 16.

[0036] In summary, in this device, when the sliding sealing ring 32 descends, the mounting plate 5 abuts against the outer wall of the sealing cover 61, which drives the hemispherical sealing cover 61 to rotate around the hinge seat 6 and precisely cover the sewage inlet 16. This effectively prevents sewage from flowing back from the sewage inlet 16 into the soil layer and foundation pit during the backflushing process, avoiding pollution of the foundation pit environment or increasing the burden of water treatment. On the other hand, the sealing cover 61 is designed as a hemispherical shape, which not only ensures a tight cover of the sewage inlet 16, but also allows it to be smoothly pushed to rotate in the opposite direction by the water pressure inside the soil layer after the mounting plate 5 is reset. This allows the mud and sand in the foundation pit and soil layer to enter the storage chamber 19 normally through the sewage inlet 16 without affecting the sewage collection function of the device. The overall structure achieves automatic sealing and opening through mechanical linkage, without the need for additional power or manual operation. It works synchronously with the backflushing process, further improving the automation and reliability of the device operation.

[0037] Reference Figure 3 , Figure 4 and Figure 9 The filter section 7 includes a filter screen 73. A fixing ring 72 and a sliding ring 71 are fixedly installed at both ends of the filter screen 73. The fixing ring 72 is fixedly installed at the bottom of the side wall of the mounting cylinder 2, and the sliding ring 71 is slidably installed at the top of the side wall of the mounting cylinder 2. A second connecting block 74 is fixedly installed at the top of the sliding ring 71. The second connecting block 74 is fixedly connected to the side wall of the first wedge block 35. The filter screen 73 is a flexible mesh.

[0038] When the sliding sealing ring 32 descends, the first wedge block 35 drives the sliding ring 71 to move down along the side wall of the mounting cylinder 2 through the second connecting block 74. The flexible filter screen 73 is in a relaxed state due to the reduced distance between the sliding ring 71 and the fixed ring 72, and the mesh naturally widens. After the backflushing is completed, the elastic element 54 drives the first wedge block 35 to reset and move upward, and the sliding ring 71 moves upward accordingly. The filter screen 73 is tightened by the sliding ring 71 and the fixed ring 72, and the mesh is stretched and deformed by the tension. During backflushing, the mesh of the relaxed filter screen 73 widens, which facilitates the rapid passage of impurities carried by the backflushing water. After resetting, the mesh of the tightened filter screen 73 is stretched and returns to a fine filtration state, ensuring the interception effect of mud and sand during normal water pumping.

[0039] In summary, this device achieves several advantages. First, by allowing the filter screen 73 to switch between relaxed and tightened states as the sliding ring 71 rises and falls, the wider mesh during backwashing reduces water flow resistance, allowing the backwash water to flush and carry impurities out more smoothly, thus improving backwashing cleaning efficiency. Second, during normal water pumping, the filter screen 73 tightens and the mesh lengthens, forming a finer filtration interface, enhancing the interception effect of fine sediment and further ensuring the cleanliness of the water pumped out by the pumping pipe 81. Third, this dynamic adjustment mechanism is mechanically linked to the device's backwashing and reset processes, enabling automatic switching of the filter screen 73's state without additional control components. This strengthens the targeting of filtration and backwashing, simplifies the device structure, and improves operational reliability.

[0040] Reference Figure 3 and Figure 11 It also includes a diversion plate 93 fixedly installed in the mounting sleeve 22. The diversion plate 93 is provided with an arc-shaped water spray channel 931. When in use, high-pressure clean water enters the diversion plate 93 and is sprayed in a spiral water flow towards the inner wall of the mounting cylinder 2 and the filter screen 73 through the guidance of the arc-shaped water spray channel 931.

[0041] This spiral water flow can generate a rotating flushing force along the inner wall of the mounting cylinder 2. On the one hand, it can fully cover all areas of the filter section 7, avoiding backwash dead zones and improving the cleaning coverage of the filter screen 73. On the other hand, the centrifugal force generated by the rotating water flow can enhance the removal effect of impurities on the surface of the filter screen 73, while driving the impurities to move towards the storage chamber 19. This, combined with the subsequent sewage discharge process, can more thoroughly remove impurities. In addition, the flow guiding design of the arc-shaped water spray channel 931 makes the impact force of the high-pressure purified water more concentrated and evenly distributed, which not only improves the backwashing efficiency, but also avoids damage to the filter screen 73 caused by excessive local water flow, thus extending the service life of the filter section 7.

[0042] Reference Figure 3 and Figure 6 A first water level probe 10 is fixedly installed at the bottom of the diversion plate 93, and a second water level probe 101 is fixedly installed at the bottom of the inner side wall of the mounting cylinder 2.

[0043] When the filtered water overflows the first water level probe 10, the first water level probe 10 controls the external water pump to pump water. When the filtered water is lower than the second water level probe 101, the second water level probe 101 controls the external water pump to stop working.

[0044] In summary, on the one hand, the coordinated control of the first water level probe 10 and the second water level probe 101 enables the intelligent operation of the water pump, which automatically starts when the water level is full and automatically stops when the water level is low. This eliminates the need for manual monitoring of the water level inside the installation cylinder 2, significantly reducing labor costs and preventing water overflow or empty pump operation due to untimely manual operation. On the other hand, the setting for the first water level probe 10 to trigger pumping ensures that the water pump is started only after the filtered water in the installation cylinder 2 has reached a certain volume, avoiding frequent start-stop cycles (such as starting when the water level has just passed the inlet hole 21), thus extending the service life of the water pump. Thirdly, the setting for the second water level probe 101 to trigger shutdown prevents the water pump from running dry when the water level in the installation cylinder 2 is too low, avoiding problems such as pump overheating and component wear caused by dry running. It also prevents the small amount of impurities that may have accumulated at the bottom of the installation cylinder 2 (not completely removed by backflushing) from being pumped into the pipeline, further ensuring the stability of the precipitation system and the cleanliness of the water.

[0045] In summary, this device, with the help of the soil-breaking blocks on the outer walls of the cone head 11 and the pedestal 12, and the top handle 17, can be directly pressed and buried into the foundation pit by the excavator bucket without the need for special drilling equipment. At the same time, it supports the excavation of the surrounding soil first, leaving a safe soil layer of 20 to 30 centimeters, and then pressing the soil in the safe range a second time to make the device lower than the safe water level of the foundation pit again. It is compatible with the foundation pit excavation process and reduces the impact of installation on the construction progress.

[0046] The flexible filter screen 73 of the filter section 7 in this device can efficiently intercept mud and water impurities and prevent them from entering the installation cylinder 2. The filter screen 73 can switch between relaxed and tightened states as the sliding ring 71 rises and falls. When backflushing, the mesh widens to improve the efficiency of impurity discharge. When pumping water normally, the mesh lengthens to enhance the filtration accuracy. With the independent water pumping pipe 81 and sewage discharge pipe 92, it can ensure water pumping efficiency and continuously output clean water.

[0047] In this device, during backflushing, high-pressure clean water forms a spiral water flow through the arc-shaped spray channel 931 of the diversion plate 93, which can cover the filter screen 73 without dead angles and use centrifugal force to remove impurities; at the same time, the sliding sealing ring 32 descends and simultaneously triggers the sealing of the top water inlet, seepage hole 15 and sewage inlet 16 to prevent backflushing sewage from overflowing into the foundation pit or seeping back into the soil layer, ensuring that the backflushing process does not affect the drying of the foundation pit and the stability of the soil layer.

[0048] The water pump is controlled by the first water level probe 10 and the second water level probe 101 in a coordinated manner, so that it can start automatically when the water is full and stop automatically when the water is low, without the need for manual monitoring of the water level. This not only avoids water overflow or empty pump operation caused by untimely manual operation, but also reduces the frequent start and stop of the water pump, extends the service life of the equipment, and significantly reduces the manpower input on the construction site.

[0049] All cleaning and sewage discharge operations in this device do not require disassembly. Backflushing cleaning only requires starting the high-pressure water pump, and sewage discharge is directly connected to the collection tank through the sewage pipe 92. All sliding parts are equipped with guide structures (guide column 41, slide groove, etc.) to prevent jamming, and elastic element 54 drives the sealing structure to automatically reset, reducing the frequency of failures and maintenance difficulty, and ensuring long-term stable operation of the device.

[0050] The device uses the lifting and lowering of the sliding sealing ring 32 as its core, and synchronously links the state adjustment of the filter screen 73, the sealing of multiple parts, and the backwash water flow guidance functions. It does not require additional power or complex electrical control systems, and achieves multiple effects with one action. Moreover, the design of multiple effects with one action simplifies the structure of the device and avoids the coordination problem of independent control of multiple components, thereby improving the reliability of operation.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A self-induction pumping device for deep foundation pit dewatering, characterized in that, include: The outer casing includes a well wall pipe (1) with seepage holes (15) on its side wall, a cone (11) is fixedly installed at the bottom of the well wall pipe (1), a storage cavity (19) is provided inside the cone (11), and a frustum (12) is fixedly installed at the top of the well wall pipe (1). The filter inner liner includes an installation cylinder (2) disposed inside the well wall pipe (1) and coaxial with the well wall pipe (1) and a filter part (7) sleeved on the outer wall of the installation cylinder (2). A sealing block (8) is fixedly installed on the top of the mounting cylinder (2), and a water pumping pipe (81) extending into the mounting cylinder (2) and a sewage pipe (92) extending into the storage cavity (19) are fixedly installed on the sealing block (8). A drive component is disposed on the mounting cylinder (2); The backwash sealing component is installed inside the housing. When the water pressure inside the drive component increases, the drive component drives the sealing component to seal the housing. When the water pressure inside the drive component decreases, the elastic element (54) in the drive component drives the sealing component to reset.

2. The self-induction pumping device for deep foundation pit dewatering according to claim 1, characterized in that, The outer casing also includes a cone (12) fixedly installed on the top of the well casing (1). A first soil-breaking block (13) is fixedly installed on the outer wall of the cone (12), and a second soil-breaking block (14) is fixedly installed on the outer wall of the cone (11). The maximum diameter of the cone (11) and the cone (12) is greater than the diameter of the well wall pipe (1). A handle (17) is fixedly installed on the top of the cone (12).

3. The self-induction pumping device for deep foundation pit dewatering according to claim 1, characterized in that, The cone (11) has a sludge inlet hole (16) on its conical wall. The bottom of the storage cavity (19) is a downwardly recessed groove. The wall of the mounting cylinder (2) has a water inlet hole (21). An arc-shaped first connecting block (18) is fixedly installed on the inner side of the storage cavity (19). The mounting cylinder (2) is fixedly connected to the first connecting block (18). The bottom of the mounting cylinder (2) has an upwardly recessed flow-gathering groove. The water inlet end of the bottom of the pumping pipe (81) and the water inlet end of the bottom of the sewage pipe (92) are both equipped with check valves.

4. The self-induction pumping device for deep foundation pit dewatering according to claim 1, characterized in that, The drive assembly includes a mounting sleeve (22) fixedly mounted on the top of the mounting cylinder (2). A first groove (23) is provided on the side wall of the mounting sleeve (22). A sealing slider (34) is slidably mounted in the first groove (23). A piston plate (33) is fixedly mounted inside the mounting sleeve (22) from the sealing slider (34). A drain pipe (91) is fixedly mounted at the bottom of the piston plate (33). A pressure control valve is provided on the drain pipe (91). A sliding sealing ring (32) is fixedly mounted on the outside of the mounting sleeve (22) from the sealing slider (34). A clean water pipe (9) is fixedly mounted on the top of the mounting sleeve (22). The inlet end of the clean water pipe (9) is connected to a high-pressure water pump outside the pit.

5. A self-induction pumping device for deep foundation pit dewatering according to claim 4, characterized in that, The plugging assembly includes a plugging head (52), an mounting frame (4) is fixedly installed on the inner wall of the well wall pipe (1), a second sliding groove (42) is provided on the mounting frame (4), an mounting plate (5) is slidably installed in the second sliding groove (42), a guide column (41) is fixedly installed on the mounting frame (4), the mounting plate (5) is slidably connected to the guide column (41), the plugging head (52) is fixedly installed on the mounting plate (5), a connecting rod (51) is slidably installed on the mounting frame (4), one end of the connecting rod (51) is fixedly connected to the mounting plate (5), and a second wedge block (53) is fixedly installed on the other end of the connecting rod (51). A pushing assembly (3) for driving the second wedge block (53) to slide is provided at the bottom of the sliding sealing ring (32).

6. The self-induction pumping device for deep foundation pit dewatering according to claim 5, characterized in that, The push assembly (3) includes a drive sleeve (31) fixedly installed at the bottom of the sliding sealing ring (32), a first wedge block (35) fixedly installed on the side wall of the drive sleeve (31), and an elastic element (54) sleeved on the guide post (41). The two sides of the elastic element (54) abut against the inner wall of the mounting plate (5) and the well wall pipe (1), respectively.

7. A self-induction pumping device for deep foundation pit dewatering according to claim 6, characterized in that, The sealing assembly also includes a sealing cap (61), and a hinge seat (6) is fixedly installed on the inner wall of the cone (11). The sealing cap (61) is rotatably mounted on the hinge seat (6). The sealing cap (61) is hemispherical. When the sliding sealing ring (32) descends, the mounting plate (5) abuts against the outer wall of the sealing cap (61).

8. A self-induction pumping device for deep foundation pit dewatering according to claim 5, characterized in that, The filter section (7) includes a flexible filter screen (73). A fixed ring (72) and a sliding ring (71) are fixedly installed at both ends of the filter screen (73). The fixed ring (72) is fixedly installed at the bottom of the side wall of the mounting cylinder (2). The sliding ring (71) is slidably installed at the top of the side wall of the mounting cylinder (2). A second connecting block (74) is fixedly installed at the top of the sliding ring (71). The second connecting block (74) is fixedly connected to the side wall of the first wedge block (35).

9. A self-induction pumping device for deep foundation pit dewatering according to claim 8, characterized in that, A diversion plate (93) is fixedly installed inside the mounting sleeve (22). An arc-shaped water spray groove (931) is provided inside the diversion plate (93). When in use, high-pressure clean water enters the diversion plate (93) and is sprayed into the inner wall of the mounting cylinder (2) and the filter screen (73) in a spiral flow by the guidance of the arc-shaped water spray groove (931).

10. A self-induction pumping device for deep foundation pit dewatering according to claim 9, characterized in that, The bottom of the diversion plate (93) is fixedly installed with a first water level probe (10), and the bottom of the inner wall of the side wall of the mounting cylinder (2) is fixedly installed with a second water level probe (101).

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